1: /*
2: * $Id: stp.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
3: *
4: * libnet 1.1
5: * Build an STP frame
6: *
7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
8: * All rights reserved.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
31: */
32:
33: #if (HAVE_CONFIG_H)
34: #include "../include/config.h"
35: #endif
36: #include "./libnet_test.h"
37:
38: #define CONF 1
39: #define TCN 2
40:
41: int
42: main(int argc, char *argv[])
43: {
44: int c, len, type;
45: libnet_t *l;
46: libnet_ptag_t t;
47: u_char *dst, *src;
48: u_char rootid[8], bridgeid[8];
49: char *device = NULL;
50: char errbuf[LIBNET_ERRBUF_SIZE];
51:
52: printf("libnet 1.1 packet shaping: [STP]\n");
53:
54: device = NULL;
55: src = dst = NULL;
56: type = CONF;
57: while ((c = getopt(argc, argv, "cd:i:s:t")) != EOF)
58: {
59: switch (c)
60: {
61: case 'c':
62: type = CONF;
63: break;
64: case 'd':
65: dst = libnet_hex_aton(optarg, &len);
66: break;
67: case 'i':
68: device = optarg;
69: break;
70: case 's':
71: src = libnet_hex_aton(optarg, &len);
72: break;
73: case 't':
74: type = TCN;
75: break;
76: default:
77: usage(argv[0]);
78: exit(EXIT_FAILURE);
79: }
80: }
81:
82: if (src == NULL || dst == NULL)
83: {
84: usage(argv[0]);
85: exit(EXIT_FAILURE);
86: }
87:
88: /*
89: * Initialize the library. Root priviledges are required.
90: */
91: l = libnet_init(
92: LIBNET_LINK, /* injection type */
93: device, /* network interface */
94: errbuf); /* errbuf */
95:
96: if (l == NULL)
97: {
98: fprintf(stderr, "libnet_init() failed: %s", errbuf);
99: exit(EXIT_FAILURE);
100: }
101:
102: if (type == CONF)
103: {
104: rootid[0] = 0x80;
105: rootid[1] = 0x00;
106: rootid[2] = 0x00;
107: rootid[3] = 0x07;
108: rootid[4] = 0xec;
109: rootid[5] = 0xae;
110: rootid[6] = 0x30;
111: rootid[7] = 0x41;
112:
113: bridgeid[0] = 0x80;
114: bridgeid[1] = 0x00;
115: bridgeid[2] = 0x00;
116: bridgeid[3] = 0x07;
117: bridgeid[4] = 0xec;
118: bridgeid[5] = 0xae;
119: bridgeid[6] = 0x30;
120: bridgeid[7] = 0x41;
121:
122: t = libnet_build_stp_conf(
123: 0x0000, /* protocol id */
124: 0x00, /* protocol version */
125: 0x00, /* BPDU type */
126: 0x00, /* BPDU flags */
127: rootid, /* root id */
128: 0x00000001, /* root path cost */
129: bridgeid, /* bridge id */
130: 0x8002, /* port id */
131: 0x00, /* message age */
132: 0x0014, /* max age */
133: 0x0002, /* hello time */
134: 0x000f, /* forward delay */
135: NULL, /* payload */
136: 0, /* payload size */
137: l, /* libnet handle */
138: 0); /* libnet id */
139: if (t == -1)
140: {
141: fprintf(stderr, "Can't build STP conf header: %s\n",
142: libnet_geterror(l));
143: goto bad;
144: }
145: }
146: else
147: {
148: t = libnet_build_stp_tcn(
149: 0x0000, /* protocol id */
150: 0x00, /* protocol version */
151: 0x80, /* BPDU type */
152: NULL, /* payload */
153: 0, /* payload size */
154: l, /* libnet handle */
155: 0); /* libnet id */
156: if (t == -1)
157: {
158: fprintf(stderr, "Can't build STP tcn header: %s\n",
159: libnet_geterror(l));
160: goto bad;
161: }
162: }
163:
164: t = libnet_build_802_2(
165: LIBNET_SAP_STP, /* DSAP */
166: LIBNET_SAP_STP, /* SSAP */
167: 0x03, /* control */
168: NULL, /* payload */
169: 0, /* payload size */
170: l, /* libnet handle */
171: 0); /* libnet id */
172: if (t == -1)
173: {
174: fprintf(stderr, "Can't build ethernet header: %s\n",
175: libnet_geterror(l));
176: goto bad;
177: }
178:
179: t = libnet_build_802_3(
180: dst, /* ethernet destination */
181: src, /* ethernet source */
182: LIBNET_802_2_H + ((type == CONF) ? LIBNET_STP_CONF_H :
183: LIBNET_STP_TCN_H), /* frame size */
184: NULL, /* payload */
185: 0, /* payload size */
186: l, /* libnet handle */
187: 0); /* libnet id */
188: if (t == -1)
189: {
190: fprintf(stderr, "Can't build ethernet header: %s\n",
191: libnet_geterror(l));
192: goto bad;
193: }
194: /*
195: * Write it to the wire.
196: */
197: c = libnet_write(l);
198:
199: if (c == -1)
200: {
201: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
202: goto bad;
203: }
204: else
205: {
206: fprintf(stderr, "Wrote %d byte STP packet; check the wire.\n", c);
207: }
208: free(dst);
209: free(src);
210: libnet_destroy(l);
211: return (EXIT_SUCCESS);
212: bad:
213: free(dst);
214: free(src);
215: libnet_destroy(l);
216: return (EXIT_FAILURE);
217: }
218:
219:
220: void
221: usage(char *name)
222: {
223: fprintf(stderr, "usage %s -d dst -s src -t -c [-i interface]\n",
224: name);
225: }
226:
227: /* EOF */
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